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Module GPRS: CMUX fonction

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alcaza

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Hello evryone!!
I use a module GPRS (wismo228) to tranmit data. This module is on serie with pic24. I want to send AT commande and Data at the same time. This fonctionality is only possible by using the CMUX fonction. But i don't know how to implemant this cmux fonction in the pic. Does anyone can help me for that?
Thank
 

Hi, you have to enable the multiplexer mode by sending "at+cmux=0\r" to the modem.
Then, the gsm0710 protocol stack (which you have to code) will take care of the encapsulation.
https://www.3gpp.org/ftp/Specs/html-info/0710.htm
Finally, in your main program you open two channels, one for the AT commands and one for the data.
 

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